Only works from ghc 8.10 onwards

2 files changed, 10 insertions, 4 deletions

diff --git a/ghc-gc-hook.cabal b/ghc-gc-hook.cabal
index b7ed15d..c39b3c2 100644
--- a/ghc-gc-hook.cabal
+++ b/ghc-gc-hook.cabal
@@ -21,7 +21,7 @@ library
   hs-source-dirs: src
   c-sources: cbits/hook.c
   build-depends:
-    base >= 4.13 && < 4.17,
+    base >= 4.14 && < 4.17,
     clock
   default-language: Haskell2010
   cc-options: -Wall
@@ -33,10 +33,11 @@ test-suite test
   hs-source-dirs: test
   c-sources: test/cbits/testhook.c
   build-depends:
-    base >= 4.13 && < 4.17,
+    base >= 4.14 && < 4.17,
     ghc-gc-hook,
     clock
   default-language: Haskell2010
+  cc-options: -Wall
   ghc-options: -Wall -threaded
 
 source-repository head
diff --git a/src/GHC/GC_Hook.hs b/src/GHC/GC_Hook.hs
index b3e1947..250441c 100644
--- a/src/GHC/GC_Hook.hs
+++ b/src/GHC/GC_Hook.hs
@@ -1,3 +1,7 @@
+{-|
+Make use of GHC's GC hook functionality from Haskell. This is still a very
+bare-bones API.
+-}
 {-# LANGUAGE ForeignFunctionInterface #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE TypeApplications #-}
@@ -109,8 +113,9 @@ enableGClogging yes = c_gchook_enable_logging (CBool (if yes then 1 else 0))
 -- | Set a C function to be called after every GC. Use this in the following manner:
 --
 -- * Create a file @cbits/something.c@ in your project (the actual file name
---   doesn't matter), and add @c-sources: cbits/something.c@ to the stanza of
---   the correct component in your .cabal file.
+--   doesn't matter), and add @c-sources: cbits/something.c@ (and, if you wish,
+--   @cc-options: -Wall@) to the stanza of the correct component in your .cabal
+--   file.
 -- * Put the following in it: (The function names are unimportant.)
 --
 -- > #include "Rts.h"